Due to defect switching modules, a few apartments in house L might be unable to establish a wired internet connection. Since this also affects some Wi-Fi access points, the Wi-Fi connection in house L 6d and 6e might be unstable, weak or even unavailable, depending on the location. We are working on replacing the broken modules and restoring the connection.
Update 2023-01-30 23:33
We have restored the conection for the users.
Apparently the modules weren't defect but just marked as faulted and thus disabled by the switch.
Pulling them out and plugging them back in resolved the issue.